feat(web): Add image2text model option support in KnowledgeBase creation

- Extend model options merging logic to include 'image2text' type alongside 'llm'
- Combine image2text model options with llm and chat options for unified selection
- Enable image2text models to be available in the CreateModal component

web/src/views/KnowledgeBase/components/CreateModal.tsx

@@ -656,7 +656,7 @@ const CreateModal = forwardRef<CreateModalRef, CreateModalRefProps>(({
       {currentType !== 'Folder' && dynamicTypeList.map((tp) => {
         const fieldKey = typeToFieldKey(tp);
         // When tp is 'llm', merge llm and chat options
-        const options = tp.toLowerCase() === 'llm' 
+        const options = tp.toLowerCase() === 'llm' || tp.toLowerCase() === 'image2text'
           ? [...(modelOptionsByType['llm'] || []), ...(modelOptionsByType['chat'] || [])]
           : modelOptionsByType[tp] || [];
         return (